Helmet cover



FIG. 1 is a right side view of a helmet cover showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a top view thereof. 

CLAIM The ornamental design for a helmet cover, as shown and described. 